Valley County, MT

ZIP 59231

In ZIP 59231, 3 of the 12 things we check have at least one part graded D or F.

• Drinking water: North Valley County Water And Sewer Dist meets every EPA legal limit; 7 contaminants are above health goals, led by bromodichloromethane at 197× California’s Public Health Goal.
• Closer to Superfund sites than 0% of U.S. neighborhoods, with no listed site within 10 miles of its center.
• Fine particles (PM2.5) average 6.1 µg/m³; the WHO guideline is 5 and the EPA annual standard is 9.
• About 181,591 kg of agricultural pesticides are applied in the county each year.

Grades for ZIP 59231

• Superfund sites nearbyA
• Factories and industrial sitesA
• Oil and gas wellsA
• Parks and nature nearbyA
• Air qualityA
• Drinking water qualityB to C
• Pesticide useF
• Neighborhood health statusF
• Past wildfire impactsA
• Past flood impactsA
• Noise levelsA
• Radiation signalsD

Based on 1 census tract · compiled October 25, 2026 · how each grade works and its sources

Loading the full report, with every source…